Bobbin for electrical weft detectors



March 24, 1931. R TURNER BOBBIN FOR ELECTRICAL WEFT DETECTORS Filed Nov. 2, 1929 H II W FIEQj J/vvE/v TU FP/ CHAl-TD G. TURNER 4/ Y M ATTURNE d,

Patented Mar. 24, 1931 came PATENT- OFFICE Brennan's.- TURNER, or won'cnsrn'n vrnssAcHUsETTs, AssIGNoR 'ro GROMPION & KnowLEsLooM :woaxs or woncns'rnn, MASSACHUSETTS, A CORPORAT'IONOF MASSACHUSETTS LBOBBIN' roRnLncrmoAL warm nnrncmons Application e d mama ees. SeriaIlNo. 404,464.

This inventionirelates to improvements in. bobbins for looms having "electrical weft detectors to effect replenishment or stopthe loom .when'the weft is substantially exhausted, and itis thegeneral object of the men-j tion to provide an improved fabric to be. Wound on the yarircarrier. and having ex-- posed metallic vstrands to cooperate with th-e detector.

Electrical weft detectors for 'looms ma y comprise a pairof oppositely charged" electrodes which Whenelectrically connected. by the bobbin or yarn'carrier will, causeenen,

giaation of an electromagnetic} device capable of affecting the operation cftheloom.

It is an important object of myprese'nt' invention' towrap the yarn carrier with a fabric the weft. ofwhich fis preferably formed of-wire, the purpose being to provide continuity such as could not conveniently be had if the warp threads only were metallic.

It is a furtlier-objectof my present invention'topr'ovide a'fabric of textile yarn's and wire, the textile yarns being-on one side and coated With a'n' adhesive and'the wires being on the opposite side-andexposed for contact; with an electrical feelerl It is'desiralo'le thatf the textile yarnfsuch for instance as cot} ton; and the wires'be so' interwoventhat an appreciable area of wire will be presented tothe detector; and to achieve this resultIf prefer to employaweave somewhat similar to that used in satin, the wire filling floating overlseveral strands of; warp. threads The effect of this construction is to produce a large metallic surface onjone' side Qof the fabric and a comparatively largecotton or; 21 and under one of Said p the repeat similar surface on the reverse side to re ceiveadhesive.

a convenient is set forth,

Fig. l-is a top plan'vie'w:of abobbinmade according to mypresent invention'with the electrodes ofan electrical weft detector indicator,

Fig. 2- is a vertical section on line Of Fig/1, l

of the tape'having'one corner turned back to illustrate characteristics thereof.

1 Referring to Fig.1, I haveshown abob binlO having the usual rings 11 and barrel12. The bobbin set forth in]? ig. 1 is substantially empty and should act to cause replenishment. The electrical weft detector comprises positively and negatively charged electrodes 13 and 14:, respectively, which may be connected in any approved manner to an external circuit including devices not shown to effect a changelnthe operation of the loom when'said electrodes are electrically connected together. Looms operating in this general manner are known and'it is not deemed necessaryto enter into a detailed description of them.

"My invention relates more particularly to.

themeans for bringing about the electrical connection between the electrodes, andj'in carrying my inventioninto effect I provide aweborfabrlc 20 having cotton or similar warp threads21 and transverse filling 22.

formed of bare wire. In order that the fabric may have oneside thereof provided with a large amount of'wire I preferably employ the weaveset forth in Fig. 8 where it will be noted that 'the' wire 22 lies over'three warps then coated with an adhesive designated here-1 in generally at 23. By means of the adhesive" a properly cut length of the fabric may be' secured to the barrel 12 of the bobbin. In this way the metallic surface is exposed to have-contact withthe detector electrodes,-

. weft, will suffice.

whereas the non-metallic yarns are on the under side where they efiectively cooperate with the adhesive to hold the fabric to the bobbin.

It will be understood that as depletion approaches duringthe weaving operation the weft will be unwound to uncover-the Wire of the fabric to both of the electrodes 'thereby bringing about the closing of the previously referred to circuit. r

l/Vhi'le l have referred to the as we ton, yet any yarn which will take the ad hesive and be strong enough to hold the Wire During thepreparat'ion of the weft a conditioning operation is sometimes carried out after Winding onthe bobbins, andfor this reason I may employ an adhesive which is not affected by moderate degrees of heat or moisture. .A plain weave might be used instead of the one set forth,

. because, the; soft wtextile yarns will compress to allow the electrodes to engage the I613, tively harder wire. In fact, my. invention is considered broad enough to include a bobbin; having the-r'eonany form of fabric which includes in its. .constructlon electric current conducting yarns, strands or the like.

From the foregoing it-will be seen that I have provided a simple form of fabric having metallic and adhesive retaining yarns, the metallic yarns on one side coacting when uncovered with thefdetector elements, and the other side of the fabric being held to the bobbin.

electrical continuity of the various-parallel v, strands of wire is accomplished by having 5 them formed as the weft of the fabric. It will also be seen that by employing a form of weave. wherein the wire passes over the nonmetallic filaments I .provide a surface which is practically continuous so as to insure prop-' er contact with the electrodes. V I Having thus described my inventionit will be seen that changes andmodifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I- do not wish to be lim ited to the details herein disclosed, but what I claimis: r 7

v1. A bobbin for an electrical weft detector having two oppositely charged electrodes to beelectrically connected at sub-- stantial weft exhaustion, said bobbin having a fabric secured thereto positioned for engagement with the electrodes and havingmetallic exposed strands and non-metallic strands fastened tovthe bobbin. I

2. A bobbin. for an electrical weft detecto having two oppositely charged electrodes to be electrically connected at substantial weft exhaustion, a fabric including metallic andnon metallic yarns, the non-metallic yarns being held to the bobbin by anadhesive and the metallic yarns being exposed to have enga-gement withthe electrodes. 7

3. Abobbin for an electrical weft detector It will further be seen thatthev having two oppositely charged electrodes to be electrically connected at substantial weft exhaustion, a fabric formed of metallic and non-metallic yarns, the metallic yarns being continuous and positioned to contact with the electrodes when the bobbin is substantially empty, and the non-metallic yarns being held to the bobbin by an adhesive.

4. A bobbinfor an electrical weft detector having. two oppositely charged electrodes to be electrically connected at substantial weft exhaustion, a fabric having a metallic weft and non-metallic warps, the weft positioned for engagement with the electrodes of a substanti'al'ly empty bobbin and the warp being held to the bobbin by an adhesive.

- 5. A bobbin for an electrical weft detector having two oppositely charged electrodes to be electrically connected at substantial weft exhaustion, a fabric mounted on the bobbin, the greater portion of one sideof the fabric being metallic yarns which are positioned for engagement with the electrodes, and the greater portion of the other side of the fabric being non-metallic yarns which are held to the bobbin by an adhesive. x l

6. A bobbin for an electrical weft detector having two oppositely charged electrodes to be electrically connected at substantialweft exhaustiom a fabric mounted on the bobbin the greater portion of one side of which has metallic yarns positioned for engagement with theelectro'des, and the greater portion .of the other side of the fabric being nonmetallic yarns which are attached to the bobb' 7. A bobbin for an. electrical weft detector having two oppositely charged electrodes to be electrically connected at substantial weft, exhaustion, a fabricheld to the bobbin having non-metallic warp and metallic weft threads, the weft passing" over a relatively large number of warps and under a comparatively *small number thereof to present a large metallic surface to have engagement with the electrodes, the non-metallic warps lying under a majority of the metallic wefts and over a comparatively few of said weft-s so as to present a surface on the under side of the fabric which may be secured to the bob.- bin by anadheSive'.

'8. A bobbin for an electrical weft detector having two oppositely charged electrodes to be electrically connected at substantial weft exhaustion, a fabric secured to the cylindrical portion of the bobbin having relatively inflexible metallic yarns substantially parallel to the axis of the bobbin and having flexible non-metallic yarns extend-ing transverse of the axis of the bobbin, the metallic yarns beingpositioned for engagement with the electrodes and the flexible yarns being secured to the bobbin by an adhesive. f

9. A bobbin for an-electrical weft detector having two oppositely charged electrodes to be electrically connected at substantial weft exhaustion, a fabric secured to the bobbin having yarns which are capable of conducting electricity and other yarns which can be readily secured to the bobbin by an adhesive,

the conducting yarns being exposed when the bobbin is substantially empty to have contact with the electrodes.

10. A bobbin for an electrical weft detector having two oppositely charged electrodes to be electrically connected at substantial weft 11. A bobbin for-an electrical weft detector having two oppositely charged electrodes to be electrically connected at substantial weft exhaustion, a fabric secured to the bobbin having two systems of threads, one system being metallic and extending alongthe surface of the bobbin in a direction substantially parallel to the axis thereof and positioned for engagement Withthe electrodes, the other system of threads by an adhesive, said systems of threads being interlaced so that the conducting yarns are held in position on the bobbin.

12. A bobbin for an electrical weft detector having two oppositely charged electrodes to '7 s 0 be electrically connected at substantial weft exhaustion, a fabric secured to the cylindrical portion of the bobbin having metallic yarns substantially parallel to the axis of the bobbin and having flexible non-metallic yarns extending transverse of the axis of the bobbin, the metallic yarns being positioned for engagement with the electrodes and the flexible yarns being secured tothe bobbin by an adhesive."

V 13. A bobbin having secured thereto a fabric composed of exposed electric conducting yarns and adhesive absorbing yarns by means of which the fabric is secured to the bobbin.

" In testimony whereofI have hereunto aff fixed my signature.

RICHARD G. TURNER.

with the elec-.-

extending peripherally around the bobbin and being held to the latter 

